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<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        var SingleTon=(function(){
           function  Tank (){
            this.dom =null;
            this.speed = 0
            this.colot
            this.run=function(){}
           }
           var instance =null//保存实例化对象
           return {
            getInstance(){
                return instance || (instance = new Tank())
            }
            

           }




        })()
        

        var q = SingleTon.getInstance()
        var w = SingleTon.getInstance()
        var e = SingleTon.getInstance()
        console.log(q,w,e);
        console.log(q=e);
        console.log(q=w);
        console.log(w=e);




    </script>
</body>
</html>
